combination structure of bottom of pan (kettle) body and heating apparatus

ABSTRACT

The present invention relates to an improvement for a combination structure of the bottom of a pan (kettle) body and a heating apparatus, and more particularly to the improvement which includes weld-bonding an aluminum alloy plate or aluminum block of similar or dissimilar materials to the bottom of a pan (kettle) body, wherein the outer side of the aluminum alloy plate or aluminum block can be molded by die casting or casting to embed an electric heating tube therein, or the aluminum alloy plate or aluminum block is preheated to a certain temperature, the softened aluminum alloy plate or aluminum block is formed with an accommodating groove for accommodating an electric heating tube, the above-described aluminum alloy plate or aluminum block and the bottom of the pan (kettle) body are joined by high speed friction heat welding, and then the electric heating tube is clamped and fixed within the accommodating groove of the aluminum alloy plate or aluminum block, or an electric heating tube is embedded in an aluminum block which is then friction welded to the pan (kettle) such that the bottom of the pan (kettle) body can be quickly weld-bonded to the aluminum alloy plate or the aluminum block.

BACKGROUND OF THE INVENTION

(a) Field of the Invention

The present invention relates to an improvement for a combinationstructure of the bottom of a pan (kettle) body and a heating apparatus,and more particularly to the improvement which includes weld-bonding analuminum alloy plate or aluminum block of similar or dissimilarmaterials to the bottom of a pan (kettle) body, wherein the outer sideof the aluminum alloy plate or aluminum block can be molded by diecasting or casting to embed an electric heating tube therein, or thealuminum alloy plate or aluminum block is preheated to a certaintemperature, the softened aluminum alloy plate or aluminum block isformed with an accommodating groove for accommodating an electricheating tube, the above-described aluminum alloy plate or aluminum blockand the bottom of the pan (kettle) body are joined by high speedfriction heat welding, and then the electric heating tube is clamped andfixed within the accommodating groove of the aluminum alloy plate oraluminum block, or an electric heating tube is embedded in an aluminumblock which is then friction welded to the pan (kettle) such that thebottom of the pan (kettle) body can be quickly weld-bonded to thealuminum alloy plate or the aluminum block.

(b) Description of the Prior Art

Today, the use of automated instruments has changed people's lives andmade them better than they would have been without these automatedinstruments before. Some automated electric appliances help people tocook some foods. General automatic cookers all have electric heatingtubes embedded therein to achieve the goal of heating and cooking. Allof the electric heating tubes are embedded in the bottoms of pan bodiesby die-casting molding means, which is only suitable for aluminumdie-casting molded pan bodies. The inventors also have an earlierapplication filed for a patent, wherein the upper surface of a pan bodyis previously coated with a promoter for welding different metalstogether. In the implementation, the upper surface of the electricheating tube can be instantly melted by a high pressure welder, and thepromoter further simultaneously promotes welding of the electric heatingtube to the surface of the pan body to form one piece. The bottom of thepan body of similar or dissimilar materials is coated with a flux. Analuminum alloy plate is closely attached to the bottom surface of thepan body and the surface thereof is instantly melted such that thealuminum alloy plate and the surface of the pan body are welded to formone piece. Thereafter, an electric heating tube is attached andinstantaneously welded to the other surface of the aluminum alloy plateso as to weld the electric heating tube to the surface of the aluminumalloy plate on the bottom of the pan body. However, such method requiresuse of a flux to weld the aluminum alloy plate and the electric heatingtube to the pan body, and it also takes longer welding time. Hightemperature resulted from the step of rising the temperature to softenthe metal and from the instant welding process would result in deformedproducts and thus cause a high defective percentage.

SUMMARY OF THE INVENTION

The present invention relates to an improvement for a combinationstructure of the bottom of a pan (kettle) body and a heating apparatus,wherein an aluminum alloy plate or aluminum block of similar ordissimilar materials is weld-bonded to the bottom of a metallic pan(kettle) body which can be of a metal material such as stainless steel,aluminum alloy, iron, or the like, wherein the outer edge surface of thealuminum alloy plate or aluminum block can be molded as one piece by diecasting or casting to embed an electric heating tube therein, or thealuminum alloy plate or aluminum block can also be preheated to acertain temperature and becomes softened, the outer edge surface of thealuminum alloy plate or aluminum block is formed with an accommodatinggroove disposed in circular outwardly extending flanges foraccommodating an electric heating tube, the size of the accommodatinggroove allows the electric heating tube to be mounted and embeddedtherein, the bottom of the pan (kettle) body and the corresponding jointface of the above-described aluminum alloy plate or aluminum block aresubjected to friction under pressure at instant high-speed rotation insuch a manner that one of the workpieces is fixed and the other isrotated and moved forward slowly such that the bottom of the pan(kettle) body and the corresponding joint face of the aluminum alloyplate or aluminum block are instantaneously welded together because alarge amount of heat generated by friction melts parts of the bottom andthe joint face to provide high adhesion between them and then they aresubjected to high-speed stamping or pressing, and thus the aluminumalloy plate or aluminum block is welded to the bottom of the pan(kettle) body, and then an electric heating tube can be mounted into theaccommodating groove on the outer edge surface of the aluminum alloyplate or aluminum block, the size of the accommodating groove allows theelectric heating tube to be mounted and accommodated therein, theelectric heating tube is clamped within the accommodating groove on theouter edge surface of the aluminum alloy plate or aluminum block in somepositions of or over the upper edges of the accommodating groove, or anelectric heating tube is embedded in an aluminum block, and then thejoint face of the aluminum block and the bottom of the pan (kettle) bodyare subjected to friction welding, which allows the pan (kettle) body tobe welded to the aluminum alloy plate or aluminum block without a fluxas well as allows short welding time, ease of processing and less easeof deformation of products such that the bottom of the pan (kettle) bodycan be quickly weld-bonded to the aluminum alloy plate or aluminumblock.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a flow chart of the present invention.

FIG. 2 is a three-dimensional exploded view of the present invention.

FIG. 3 is a schematic view showing the assembly action of the presentinvention.

FIG. 4 is a three-dimensional assembly view of the present invention.

FIGS. 5-1 and 5-2 are three-dimensional exploded and assembly views ofanother embodiment of the present invention.

FIG. 6 is a three-dimensional exploded view of another aluminum block inwhich an electric heating tube is embedded according to the presentinvention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to FIGS. 1 to 6, the present invention provides an improvementfor a combination structure of the bottom of a pan (kettle) body and aheating apparatus, wherein

an aluminum alloy plate or aluminum block 2 of similar or dissimilarmaterials is weld-bonded to the bottom 11 of a metallic pan (kettle)body 1 which can be of a metal material such as stainless steel,aluminum alloy, iron, or the like, wherein the outer edge surface 23 ofthe aluminum alloy plate or aluminum block 2 can be molded as one pieceby die casting or casting to embed an electric heating tube 3 therein,or the aluminum alloy plate or aluminum block 2 can also be preheated toa certain temperature and becomes softened, the outer edge surface 23 ofthe aluminum alloy plate or aluminum block 2 is formed with anaccommodating groove 21 disposed in circular outwardly extending flangesfor accommodating an electric heating tube 3, the size of theaccommodating groove 21 allows the electric heating tube 3 to be mountedand embedded therein, the bottom 11 of the pan (kettle) body 1 and thecorresponding joint face 22 of the above-described aluminum alloy plateor aluminum block 2 are subjected to friction under pressure at instanthigh-speed rotation in such a manner that one of the workpieces is fixedand the other is rotated and moved forward slowly such that the bottom11 of the pan (kettle) body 1 and the corresponding joint face 22 of thealuminum alloy plate or aluminum block 2 are instantaneously weldedtogether because a large amount of heat generated by friction meltsparts of the bottom and the joint face to provide high adhesion betweenthem and then they are subjected to high-speed stamping or pressing, andthus the aluminum alloy plate or aluminum block 2 is welded to thebottom 11 of the pan (kettle) body 1, and then an electric heating tube3 can be mounted into the accommodating groove 21 on the outer edgesurface of the aluminum alloy plate or aluminum block 2, the size of theaccommodating groove 21 allows the electric heating tube 3 to be mountedand accommodated therein, the electric heating tube 3 is clamped withinthe accommodating groove 21 on the outer edge surface of the aluminumalloy plate or aluminum block 2 in some positions of or over the upperedges of the accommodating groove 21, or an electric heating tube 4 isembedded in an aluminum block 4, and then the joint face 41 of thealuminum block 4 and the bottom 11 of the pan (kettle) body 1 aresubjected to friction welding, which allows the pan (kettle) body 1 tobe welded to the aluminum alloy plate or aluminum block 2, 4 without aflux as well as allows short welding time, ease of processing and lessease of deformation of products such that the bottom of the pan (kettle)body can be quickly weld-bonded to the aluminum alloy plate or aluminumblock.

1. An improvement for a combination structure of the bottom of a pan(kettle) body and a heating apparatus, characterized in that: analuminum alloy plate or aluminum block of similar or dissimilarmaterials is weld-bonded to the bottom of a metallic pan (kettle) bodywhich can be of a metal material such as stainless steel, aluminumalloy, iron, or the like, wherein the outer edge surface of the aluminumalloy plate or aluminum block is molded as one piece by die casting orcasting to embed an electric heating tube therein, the bottom of the pan(kettle) body and the corresponding joint face of the aluminum alloyplate or aluminum block are subjected to friction under pressure atinstant high-speed rotation in such a manner that one of the workpiecesis fixed and the other is rotated and moved forward slowly such that thebottom of the pan (kettle) body and the corresponding joint face of thealuminum alloy plate or aluminum block are instantaneously weldedtogether because a large amount of heat generated by friction meltsparts of the bottom and the joint face to provide high adhesion betweenthem and then they are subjected to high-speed stamping or pressing, andthus the aluminum alloy plate or aluminum block is welded to the bottomof the pan (kettle) body, which allows the pan (kettle) body to bewelded to the aluminum alloy plate or aluminum block without a flux aswell as allows short welding time, ease of processing and less ease ofdeformation of products such that the bottom of the pan (kettle) bodycan be quickly weld-bonded to the aluminum alloy plate or aluminumblock.
 2. The improvement for a combination structure of the bottom of apan (kettle) body and a heating apparatus as claimed in claim 1, whereinthe aluminum alloy plate or aluminum block is preheated to a certaintemperature and becomes softened, the outer edge surface of the aluminumalloy plate or aluminum block is formed with an accommodating groovedisposed in circular outwardly extending flanges for accommodating anelectric heating tube, the size of the accommodating groove allows theelectric heating tube to be mounted and embedded therein, the joint faceof the aluminum alloy plate or aluminum block and the bottom of the pan(kettle) body are subjected to friction welding, and then an electricheating tube is mounted into the accommodating groove on the outer edgesurface of the aluminum alloy plate or aluminum block, and the electricheating tube is clamped within the accommodating groove on the outeredge surface of the aluminum alloy plate or aluminum block in somepositions of or over the upper edges of the accommodating groove.
 3. Theimprovement for a combination structure of the bottom of a pan (kettle)body and a heating apparatus as claimed in claim 1, wherein an electricheating tube is embedded in an aluminum block and then the joint face ofthe aluminum block and the bottom of the pan (kettle) are subjected tofriction welding.